After looking over at the description and what the ebay shop provides, i cant really understand what they mean by : Included Fixed Price Listings which is 250 in the basic one. Can anyone help me understand?

You get 250 free fixed-priced listings that you don't have to pay an insertion fee for. That is what it means. You're still paying final value on each sale. Any fixed-price over 250, you pay the insertion fee for each new listing.